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Transmutation in ~(90)SrF_2: A density functional theory study of phase stability in ZrF_2

机译:〜(90)SrF_2中的变:ZrF_2中相稳定性的密度泛函理论研究

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摘要

The stability of multiple possible phases of ZrF_2 is computed using density-functional theory. Motivated by radioactive samples of fluorite ~(90)SrF_2 stored at the Hanford site, we consider β~- radioactive decay as the route by which the ~(90)ZrF_2 is generated. To find suitable structures for the ZrF_2 compound two methodologies are used. The first follows imaginary phonon modes from the fluorite ZrF_2 while the second employs random structure searching. Six possible ZrF_2 phases are identified; however, none of the structures resemble the lone experimentally reported orthorhombic structure for ZrF_2. Although we predict these phases to be less stable (≈0.3 eV/f.u.) than a phase-decomposed mixture of β-ZrF_4 and Zr metal, they still may be relevant due to the kinetics of formation via radioactive decay and raise questions as to the nature of the ZrF_2 structure and the state of the samples at Hanford.
机译:ZrF_2的多个可能相的稳定性是使用密度泛函理论计算的。受储存在汉福德基地的萤石〜(90)SrF_2放射性样品的激发,我们将β〜-放射性衰变视为〜(90)ZrF_2生成的途径。为了找到适合ZrF_2化合物的结构,使用了两种方法。第一个遵循萤石ZrF_2的虚构声子模式,第二个采用随机结构搜索。确定了六个可能的ZrF_2相。但是,没有一个结构类似于ZrF_2的单独实验报道的正交结构。尽管我们预测这些相比β-ZrF_4和Zr金属的相分解混合物不稳定(≈0.3 eV / fu),但由于通过放射性衰变形成的动力学,它们仍然可能相关,并提出了有关ZrF_2结构的性质以及汉福德的样品状态。

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